Vibron properties in quasi 1D molecular structures: the case of two parallel unshifted macromolecuar chains

23rd International Conference on Integrable Systems and Quantum Symmetries

evizovi, D.^1 ; Petkovi, S.^1 ; Galovi, S.^1 ; Reshetnyak, A.^2 ; Chizhov, A.^3,4

Vina Institute of Nuclear Sciences, Belgrade, Serbia^1

Institute of Strength Physics and Materials Science, SB RAS, Tomsk, Russia^2

Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna

141980, Russia^3

Dubna State University, Dubna

141980, Russia^4

关键词: Effective mass;    Hopping mechanism;    Interchain coupling;    Macromolecular chain;    Polaron models;    Quasi particles;    Structural elements;    Thermal oscillations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/670/1/012018/pdf
DOI  :  10.1088/1742-6596/670/1/012018

来源: IOP

【 摘 要 】

We study the hopping mechanism of the vibron excitation transport in the system of two parallel unshifted 1D macromolecuar chains in the framework of non-adiabatic polaron theory. We suppose that the vibron interaction with thermal oscillations of the macromolecular structural elements will result in vibron self-trapping and the formation of the partial dressed vibron state. We also suppose that quasiparticle motion takes place via a sequence of random sitejumps, in each of which the quasiparticle can migrate either to the first neighbor site of the macromolecular chain. With use of the modified Holstein polaron model, we calculate the vibron effective mass in dependence of the basic system parameters and temperature. Special attention is paid to the influence of interchain coupling on vibron dressing. We find that for certain values of the system parameters the quasiparticle mass abruptly changes.